Internal-combustion engine



A. H. FOX

aan,

April 6 1926.

INTERNAL COMBUSTION ENGINE Originaj- Filed March l5, 1922 April 6,1926. 1,579,759

, A. H. FOX

INTERNAL COMBUSTION ENGINE original Filed March l5, 1922 3 Sheets-Sheet 2 3 uvm/ufo@ 3 Sheets-Sheet 3 L Q//Z Q/IZ A. H. FOX

INTERNAL COMBUSTION ENGINE Original Filed March l5, 1922 April 6 ,1926;

Patented Apr. 6, 1926.

' unirse stares l 1,579,759 career ANSLEY H. FOX, PHLABELP-IA, PENNSYLVANIA, .ASSEGVNOl BY MESNE ASSIGN- MENTS, TO FOX EOLlDNG' COMIPANY, Ol? EHELADFJLPHIA, PENNSYLVANIA, A COR- PORATION F DELAWARE.

INTERN .AL-COMBUSTI'O ENGIE.

Application led March 15, 1922, Serial No. 543,828. Renewed November 11, 1924.

T0 all whom t may concern.'

Be it known that .1, ANsLni H. Fox, a citizen of the United States, and a resident ofthe city of Philadelphia, in the county of Philadelphia and State of Pennsylvania,

have iiwented'certain Improvements in lnternal-Combustion Engines, of which lthe following is a specification. y

My invention relates to internal combustion engines having lvalves operated by mechanismsvsuch as rocker arms an-dpush rods, in which irregular relations between coacting parts result from theheating ofthe cylinders bythe explosions therein andv the con-L ings without a corresponding or compensating changein the `push rods, causing eXcessive clearance, irregularj action and lobjectionable noise. My object is toy maintain a substantially 'constant relation between the coacting parts for operating the valves, so as to prevent this excessive clearance, irregun lar action and objectionable noise, by varying the temperature of the valve operating r mechanism, particularly push rods therefore,

with changes in the temperature of the cylinders. Y

The invention is characterized, in the i present application thereof, by heating the push rods, which operate the arms for opening' the valves inthe cylinder heads, by means of the hot gases which are exhausted from the cylinders so that the rods expand and 'contract with the expansion and contraction of the cylinders, due to variations in temperature caused by explosions therein, and the movements of the rocker arm bearings carried by the cylinders are compensated for by a corresponding change of the length of the push rods to maintain a substantially constant relation between the rocker arms and push rods.

In the accompanying drawings, Fig. 1 is a side elevation of an internal combustion engine equipped with my improvements, Fig. 2 is a broken front view thereof, Fig. 3 is an enlarged irregular sectional view taken on the line 3X-3X of Fig. 1, Fig. 4l; is a longitudinal'sectional view taken through a push rod housing transversely to the fulcrum of the corresponding rocker arm'and the cam shaft for operating the push rod, and Fig. 5 is a sectional view taken on the line 5X--5x of Figs. 2 and 3.

sequent movement of the rocker armV boar-V -The invention, in theform thereof illus trated, is applied to an internal combustion engine comprising the crank case 1 having thereon the cylinders 2 to which live gas is delivered by the conduits 3 and from which waste gas is discharged by the Aconduits t to the conduit 5, the conduits 3 and a being fixed to the cylinder heads and communicating therethrough with the cylinders by the.

port-s 6. The `valves 7, which control the ports 6, are closed by the actions on their stems 8 of the coiled 4.springs 9y andare opened by the reverse action on such stems of the rocker arms 10 which are fulcrumed on the bearings -11 carried by the parts 3. These rocker arms or levers areoperated, to depress the valve stems, by the push rods 12 when elevated by the action on their rollers 13 of cams 14 revolving in synchronous relation with the movements 'of the pistons 15 in the cylinders, the push -rods'- having atv their lower ends the guides 16k which reciprocatein the ways 17 fixed on the crank case 1 and the depression of the rods bythe action of gravity vbeing supplemented by the coiled spring 18 which bear against the bottoms of the guides 16 and tho tops of the ways 1'?.

This usual constructionhas the push rods 12 encased byl the tubes 19, havingthcir lower ends set in ythe tops of the ways 17 while their open upper ends sit in the bean ings 20 fixed to the bearings 11, and these tubes, togetherwith the push rods therein, are heated by providing the tubes with heating jackets and passing hot exhaust gases therethrough. Thesey jackets are provided kby the cast tubes 21. each having the two bottom flanges 22 engaged as collars on respective tubes 19, by the glands 23 screwed on said flanges and against the gaskets 24, and the two ltop flanges 25 in which are set the bottoms of tubes 26 having their tops closed by the glands 27 screwed thereon and the gaskets 28 therein. Tubular couplings 29 connect adjacent ends of the tubes 21 by being set therein, the end tubes 21 being connected by the respective tubes 30 and 31 with the conduit 5. Consequently a port-ion of the hot gases exhausted from the cylinders to the conduit 5 will pass through the conduit formedby the serially arranged parts 30, 21, 29 andl and will circulate within the heating chambers 32 formed by the jackets around the parts 19 and 12. This results in heating the rods 12 which are elongated thercby as the expansion of the cylinder by the explosions therein moves the bearings 11, whereby the maximum desirable clearance between the rod heads 12 and the rocker arm or lever ends 10 engaged thereby is maintained.

Having described my invention, I claim:

1. In an internal combustion engine having one or more cylinders, gas passages therefor, valves for controlling said passages, rocker arms carried by said cylinder or cylinders for operating said valves, and push rods for operating said rocker arms, the combination with said push rods, of heating .means comprising a bypass for carrying the hot exhaust gases and transferring heat therefrom to said push rods to effect the expansion thereof with the expansion of said cylinder or cylinders due to the explosions therein.

2. In an internal combustion engine provided With valve operating mechanism comprising rock-er arms having bearings connected with said engine so as to be movable by the expansion thereof and push rods for operating said rocker armsthe combination with said push rods of jackets therefor and means for passing hot exhaust gases from said engine into the space formed by said jackets t0 effect the expansion of said rods with the expansion of said engine and the movement of said bearings.

3. In an internal combustion engine provided with valve operating mechanism comprisiug rockerarms having bearings connected with said engine so as to be movable by the expansion thereof and push rods for operating said rocker arms, the combination With said push rods of tubes for encasing them and means comprising jackets forming a series of connected chambers for passing the hot exhaust gases from said engine into contact with said tubes so as to heat said rods and effect the expansion'thercof with the expansion of said engine.

a. In an internal combustion engine having valve operating mechanism comprising reciprocating rods, the .combination With said rods, of tubes encasing them, jackets on said tubes and a conduit for carrying hot exhaust gases from said engine into said jackets and in contact with said tubes'.

5. In an internal combustion engine having valve operating mechanism comprising rods and a conduit for the exhaust gases, the combination with said rods of tubes for encasing therein, and a conduit having its ends connected with said conduit first named for carrying gases into contact AWith said tubes, said conduit second named comprising tubular castings having branches through which said tubes pass and means coacting With said branches for providing heating chambers around said tubes.

Signed at Philadelphia, in the county of Philadelphia, and State of Pennsylvania, this 18th day of March, 1922.

ANSLEY H. FOX. 

